Tandem regioselective synthesis of tetrazoles and related heterocycles using iodine
作者:Ramesh Yella、Nilufa Khatun、Saroj Kumar Rout、Bhisma K. Patel
DOI:10.1039/c0ob01007c
日期:——
carbodiimides). The in situ generated heterocumulene on subsequent treatment with sodium azide at room temperature gave corresponding tetrazoles. The product regioselectivity for unsymmetrical 1,3-disubstituted thioureas was found to be correlated with the basicities (pKa's) of the parent amines attached to the thiourea. Aryl-sec-alkyl unsymmetrical thioureas gave thioamido guanidino products rather than the 5-aminotetrazoles
Aminotetrazole Synthesis from Secondary Amides by C–C Bond Nitrogenation
作者:Ning Jiao、Cheng Zhang、Jianzhong Liu、Zengrui Cheng、Junhua Li、Song Song
DOI:10.1055/a-2006-4548
日期:——
The development of novel methods for the preparation of aminotetrazoles is of long-standing interest to chemists due to the great importance of these compounds in chemistry and biology. Here, we report an efficient method for the preparation of aminotetrazoles fromsecondaryamides by selective C–C bond cleavage. Compared with the conventional laborious and cumbersome approaches to aminotetrazoles
An eco‐friendly synthesis of 5‐aminotetrazoles using trichloroisocyanuric acid as desulfurization agent of thioureas
作者:Adriana Marques Moraes、Tiago Lima da Silva、Marcio C. S. de Mattos
DOI:10.1002/jhet.4667
日期:2023.9
novel procedure for the preparation of various 5-aminotetrazoles derivatives was achieved using trichloroisocyanuric acid as a desulfurizing agent of thioureas and trimethylsilyl azide in ethyl acetate at room temperature. This methodology provided substituted 5-aminotetrazoles through a more sustainable reaction using an affordable, safe, stable, and easily handled N-halo reagent, a safer azide source
An expedient route to the azoles through oxidative desulfurization using iodine reagent
作者:Nikhil C. Jadhav、Prashant B. Jagadhane、Kavitkumar N. Patel、Vikas N. Telvekar
DOI:10.1016/j.tetlet.2012.10.114
日期:2013.1
A novel and expedient regioselective method for the synthesis of 5-aminotetrazoles and 3-amino-1,2,4-triazoles through oxidative desulfurization of corresponding 1,3-disubstituted thioureas has been discovered and optimized for the process conditions. The process is broadly applicable to structurally diverse 1,3-disubstituted thioureas. (C) 2012 Elsevier Ltd. All rights reserved.
<i>o</i>-Iodoxybenzoic Acid Mediated Oxidative Desulfurization Initiated Domino Reactions for Synthesis of Azoles
作者:Pramod S. Chaudhari、Sagar P. Pathare、Krishnacharaya G. Akamanchi
DOI:10.1021/jo2025509
日期:2012.4.20
A systematic exploration of thiophilic ability of o-iodoxybenzoic acid (IBX) for oxidative desulfurization to trigger domino reactions leading to new methodologies for synthesis of different azoles is described. A variety of highly substituted oxadiazoles, thiadiazoles, triazoles, and tetrazoles have been successfully synthesized in good to excellent yields, starting from readily accessible thiosemicarbazides, bis-diarylthiourea, 1,3-disubtituted thiourea, and thioamides.